If the lack of intake vents is the reason for the GPUs failing, then wouldn't all the unibody MBPs from 2008 to 2012 have failing GPUs? But it's only the 2011 models that have the failing GPU.
the 2008 A1286 machine has messed up weak GPU. That machine has a weak GPU and a good GPU, the 820-2330 board is the one I believe. It has lots of issues. It flickers every now and then. This machine is a boss so it doesn't fail too bad, and you can always tell it to use the dedicated GPU. This is a very scary laptop for me, an Apple with TWO GPUs, from a company that eight years in cannot perfect the one GPU design on a 15.4" pro machine.
The 820-2523 and 820-2532 are boss boards. They fail on occasion, but not much.
The 820-2850 from 2010, is the biggest pile of horse dung that any company has ever created since the HP DV9000. It is bunk. The worst motherboard I have ever worked on, ever discussed with other repair shops, the worst return rate - for GPU & NON GPU issues alike! I am working with a vendor right now who wants to stop selling us parts for these motherboards because we return so many, and I'm close to not servicing them anymore because I know at best I'm just patching up a turd.
The 820-2915 from 2011 is like an 820-2850 but with issues isolated to the GPU, not every part of the board.
The reason you see less bitching about the 2010 board than the 2011 board, even when the 2010 board fails more often, is because the failure mode differs each time. On the 2011 machine, the failure mode is the same, which gives consumers a common symptom to complain about, and rally around. The 820-2850 from 2010 is far worse than the 820-2915 from 2011. From random death to random non GPU related freezing to unrepairable PCB issues coming out of nowhere to no USB ports to turning off when you set it down on a table(big one), the 2010 is far worse than the 2011. However, the 2011 will be complained about more, and the issue will become more widespread because it is now an isolated issue - image distortion, followed by it eventually not booting.
The 820-3330 from 2012 is too new. Apple puts a timer into these machines to ensure they fail on day 1096, after the three years of Applecare runs out. I swear, it's hilarious how all of these defects seem literally PROGRAMMED to come about full scale right as Applecare is over... beautiful. We have not left this timeframe yet for the 820-3330 board from 2012, but I can't wait - I'm sure it'll suck as badly as every other year, and I'm confident that anyone who does any actual Pro work with their Macbook Pro, or even a little BF2 - will be walking through the door with a f'd up board because there's no ventilation on their high end laptop by mid 2015. I LITERALLY bet my living on it!!
I have yet to see a Retina with a failed GPU, but the retina is also too new to judge in any capacity.